fix: format large on-chain leaderboard scores gracefully

[ihsraham]

Summary

• Scores up to 1 billion display with comma formatting (e.g. 1,200)
• Larger values like uint256.max display in scientific notation (e.g. 1.157e+77) instead of overflowing the UI
• Added break-all CSS for text wrapping on the score container
• Shows real contract data -- no filtering or fake placeholders

Test plan

• Build passes locally
• Deployed and verified at https://client-coral-psi-64.vercel.app/leaderboard

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